Roger Pearson formed the Northern League in collaboration with Peter Huxley-Blythe, who was active in a variety of neo-Nazi groups with connections in Germany and North America.
Leading members of the Northern League included the Nazi racial eugenicist Hans F. K. Günther, who continued his work in the post-war period under a pseudonym.
Other active members included the founder of Mankind Quarterly, Robert Gayre, and its editors Robert E. Kuttner and Donald A. Swan; the American segregationist Earnest Sevier Cox, the ex–Waffen SS officer and post-war neo-Nazi leader Arthur Ehrhardt, and a number of post-war British fascists, though even among fascists, the Northern League was considered extremist.
[5] Northern League literature was written in the style of scientific racism (e.g., the work of Pearson's collaborator Raymond B. Cattell) and its Statement of Aims reflects 19th-century conceptions of Rasse and Volk.
"The rising tide of Color" threatens to overwhelm European society, and would result in the "biological annihilation of the subspecies", according to the Northern League.